Cateck® Premium 4 Port USB Hub with Aluminum 11 inch Shielded Cable for iMac, MacBook Air, MacBook Pro, MacBook, Mac Mini, PCs and Laptops (Electronics)
worry: even with a single device connected to the hub, there is no power. a single hard drive no longer rises, while connected directly to the computer on the same USB port, it works. The hub should "eat" power, or clipping to 500 mA, I see no o